Support use of SSH agent with kitchen-lxd_cli

[juju4]

Currently, when using inspec verifier with kitchen-lxd_cli, verifier fails

>>>>>>     Failed to complete #verify action: [Transport error, can't connect to 'ssh' backend: SSH session could not be established] on xxx

like #142

it seems needed to pass private key as argument to provider
https://github.com/bradenwright/kitchen-lxd_cli/blob/4b0abe49c3c5ef20f3b6e8c5ff0b9730b87b0e9d/lib/kitchen/driver/lxd_cli.rb#L32

[chris-rock]

@juju4 do you think you could help us with a PR similar to #192

[juju4]

I can try but from a quick look at code, inspec seems only to have key_files/keys variable

kitchen-inspec/lib/kitchen/verifier/inspec.rb

Line 246 in 09976b4

opts["key_files"] = kitchen[:keys] unless kitchen[:keys].nil?

not sure how to map ssh public key

kitchen-lxd_cli asks for public_key_path as config option
https://github.com/bradenwright/kitchen-lxd_cli/blob/4b0abe49c3c5ef20f3b6e8c5ff0b9730b87b0e9d/lib/kitchen/driver/lxd_cli.rb#L32

ideally, just want to recover public_key_path from lxd_cli driver to inspec code.
Any pointer?

example execution with puppet
https://travis-ci.org/juju4/puppet-meta-harden-linux/jobs/423403593
or ansible
https://travis-ci.org/juju4/ansible-harden/jobs/423424189

[juju4]

Any help here? Thanks